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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3425fe61506ffc21b47742d06d96f4bd5a7e4d6a9e06e0b83870e79824c37ae' 
  AND token = '02IzA0p3T6kZ6K2KeC2RITQwXkO9T4T1od5JJSOsoGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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