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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a6f33de9015c40c0c8f0ac057b3b5a19ac86a74b61185c50dcd1089cb88b8c' 
  AND token = '03bcaI6AKSFkZe2uRNAmD67XZAjecCA02fMpFcWX7m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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