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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a675098895e4390e41c72dc98aeb10779b9fcf32f4722cca1bf2ee6d8bc0660' 
  AND token = 'YpTJ4GycsCdhspBlCXcwLWfDEIDshYwTWlq1at4fa+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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