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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b318ca52c162d805784b1d62b761edcf55da2460095e4073a8e1dbf96582fb' 
  AND token = '0u8uu2aEnZP2bkoP3ybjiAac+yK2Mhh+kmhDcIrlZks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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