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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f574dbd046514793b2e5460365d49692ef784ed9c11167badde543eecf4269d5' 
  AND token = 'ffxXSH+7IBIr9H0R+abaYlnemcXok0Sb8ZHSOEDRbiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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