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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44c3ab1bf29f59bc9e3f46f380f1d5d0914c3c0de327022046a6910e1c4075f' 
  AND token = 'viC8rir23PjOEqbigTdnv93/6bVdf/qoSmU/v4tHwcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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