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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b25d3fcf8429b1bb65f59ce0dce4817739fa4ec991421d65de294844d06beb' 
  AND token = '0yUJQ4xJgZicujNJk2YnVJrJrxzI7IFOwakVEQ/zy0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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