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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9368fbbebdc08ab0dae13b0bd5c7251bc72c5c3ac7e00136dd377738483542' 
  AND token = 'IfFLixpnq8BisgIL/O1kYGNglDukCZeil3YkrRr68j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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