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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3967a38c4f361a9869690fc8d5d16141f9f6e22ad5ba6db5d711d4a6f738763a' 
  AND token = 'y+u7/e/ftC7CyYi/zAGH4ek1X+zMpFZ8SXnleKaUhxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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