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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320bc091ff7e44f2deaeb4dbde8ad08b6f2299404dca73b2246bf8b9e73c8cc1' 
  AND token = 'TptDUbKw+i23C4R1nGYT/Ks9RN39imkTderNiADzacM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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