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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1341646875bf656baa2a9ff0e3a608e82edd1b22ef42bffb3d3679417bec8ae' 
  AND token = 'Z/8oV5XhI2tj70Y9DwzcZy4dv5cNENV6xjl4QwkTtuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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