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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6720857945b5653906ba91df07089a8c5eac09324e6a2f5e010e53fa18fa51' 
  AND token = '4xh11UhD0bYXgAZ0k9wB71u2P0IpabbaXEGD73a8pxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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