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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0ffb1b48c3f9245be5d0759f642359372173f51b6c871d0641197b00605f07' 
  AND token = '5n94cagR3ZjAThfGrF9tuK1oKlRKjyXvlYqvsdRp7M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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