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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31494e8b8fad8618b9d5fb3e1464a62abfea04b940281ed5939a79945e5cdcff' 
  AND token = 'grbzDfgGJUbyaiAZwbd/DfHtmovL22jE2NfOx4gVGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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