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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58deee7981b67c29f96ee1464bd80c4e47afb824e3263b2fae4eea23b8eb76a8' 
  AND token = '0LzOEkix5j/99G+jQhlRSIjQNJ4w+Bbe6Y4PkQDKzWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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