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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babb9c0843117fd0fb04de9aa5f32d59a7bfe36de890b3e49494f92e09dbca35' 
  AND token = 'xdnwcq6jPaP6j562EbWPG7kD3UFehgwcc413fG/on+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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