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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea457524794b2965ea824af3fa3e168b5963e821270b53093118c357e82b949' 
  AND token = 'H5qdZkzkDh3/bCycM/+K5XOanxFi+AkgR4BTFHpxIAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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