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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb21264da099d9e6d1430841bb9db91f7ac59dc0ca834bd9aa60fc035afc370' 
  AND token = 'FU16pH8KnoVCwR5QmGRY2AwEpJ0lG3meHig/kbZisNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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