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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655fb874b67f6fc3e5ee4cf19cdf393ad8908311a975746aabbc642448656ddc' 
  AND token = 'dXmfVjcpyXSgm8jV1nUjXC2ko1CxQTVvigDgB7codF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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