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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6018f580b82b2ae11a837d521f44d0f302d80d7725fdbbdcc5ea744a401e424a' 
  AND token = 'lO1m2cCdV0DzJfy8eR/yiVESfsMUb9nlRozjtJLqnI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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