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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9b6e1dc3a02ccc52b6c330c216fba478c8e216107a35bd10657d2d05cbc372' 
  AND token = '1GpMyianfkFB9ml4EB8wf+Z8aor57r+EYKubXT9ASnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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