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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21aae62ee13e46a80afd18d5dcfccfdeaaefd3f040b934a153615b6decdf80a3' 
  AND token = 'RNy2MHVEl9q6Xrt2NH1T0ROWh5pGr4pY3yggFXZGYbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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