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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4fec7c1e062bb002eb31d93a92cab0dd4dae82e86c6e590fa65f8b975fcfc4' 
  AND token = 'lgyomXZHgutPo1hFFJZmP7cYsgJWwkp7K7c7S3QdG6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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