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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bd00326e31706e088fe54ab19889abfe101e750371f82e49ecdb970a46e2f9' 
  AND token = 'VbD06HlB2bUvVcwzlhHssS0ofsePJS/mWRhRvJpBW1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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