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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdd34ea7227ec1b7d77f1ec1a3a67c2ac7c08a252ec5f4c879582d6e1cb4f6e' 
  AND token = 'OFBux5eYR8e57t6vk6B12pD0+N+KCmJIJrKdE8+4Z4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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