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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3298997d20de7f768b5729ebce174070c4b991f3bff441182933fb295d990770' 
  AND token = 'cFKva9UTxy36zz/yR6OdbDP3Hkn9Dsa0MGw35rtht4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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