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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c356e3a7cee108b2341a66827c05d10937f09ae9e43829cae37d6f12ae3ad0a' 
  AND token = 'fQ2Rg6sd6Ie9ewMWVMtY5qi5Baxd/zym0pfFzOmkNDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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