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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd07b8b052b6ad10f9e36ab079055de5153a85340e13d02b977251533def2f3d' 
  AND token = 'GZsxILDN2L7JdZeeLyR87KRfPXY5AigM0SdoiKpkjcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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