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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4214e03e5fb3a88d3d1f20295c3a7123a1be9e3f6eaeeb63a56de9bf64e89f8' 
  AND token = 'LZSXIW9AUyOqp3UT7SKHOtlwXUZV9ty7aKbwT01qHsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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