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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83310fb6a1be351e48d2cdc1eae84e400b62c87bc840a81ec349ea558d0d8d4' 
  AND token = 'rB1xXXx4HCuV253HTadQoy8VRjQhvOmQMqoERmAxeJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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