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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3b0f4e8fee5087b0f93d80c8e3fc8a90359694c52b139e506c520225494a30' 
  AND token = 'FkijQRR22ALz5or/6pMEGhVpT2mIpKQaCF6u64snZfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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