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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dd9e808793b6ee7a2a6926d51e7dc0e9442a9e86fdd5bfb30124f6c1e3616c' 
  AND token = 'acAHdkQoyhS9xThDQwlI+6dVBJzqvi/15oYrx6vT1AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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