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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce795d7b9d84d1954d695e7ef63fe2e4d4108a02d27aa2758ce0ca7086a7ec9' 
  AND token = 'jxpMoU/b56ZH0w5iZj1bQndxO6r7KsDc24Mvu8HPYq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}