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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60964dc5f6299deddf96e9bc727663b6c6d5f2c5784b28d172ec0bb1f62dbdc3' 
  AND token = 't157r9RIy2hyvjnA72B0k37lEGyqAy9xv+2UuGW82eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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