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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe5dbc4d5c60321a2bf6610e1d279351889dd4202ddda45f01759902ecfdc56' 
  AND token = 'Wd3Saoer2taMXx4KrbqfRfDgb7C8TmeQCHHwpPWLd4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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