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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94d4159e53a303cdfc8f6e3fde5314ee36368588f4b1279b022a4d41ee11966' 
  AND token = '5ciB3AuroG1e9WGSho398Fe5yZrymmbFPoZefUlUqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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