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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c93da220739cfcc640fc52f22ada96c66f4d5814aa6fa5de5198f19f6d244d' 
  AND token = 'D0nwd5KIX9MJ3k3sU23T5MUQi3ULXpRANzdaJeMGkZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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