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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99974031eb9cab6c53cb11bf69c34a1f09de2676d03d77cddb600aab39b9362c' 
  AND token = 'jKW75W9KmpDKjc48JAAhbixmiBb2j4qlDOANO/yfXwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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