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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f4901518eaa0dba74f8a541608d86d92b4e16ca3ad48568756e77e153c44d4' 
  AND token = 'qMLyQuXzg0hyXJv97N31CgYJ8byDfQe+Sr7HuudN3uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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