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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e4472be2e139694455493e0582496372c313ced03c45bd7276dd5d26aab856' 
  AND token = 'XQvZoinC8bVeCK58Jnr8A6AQToX/mLnXgr8zZwqS0t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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