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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94515b6cbb001aab097a5db061becf9cf0753f085e792696b1ff92cb7e092767' 
  AND token = 'CJ9pGUQfybKOoHqssVgJr/CvLt+DT83CpvX2S4t8N2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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