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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d6f87647e5808776fcc28ec89d03abdf381f7f5fd0340d118533e42071bc32' 
  AND token = 'H8U4vKDPW+LihitJgIL8R67532xY39jWmA3mfrM/e1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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