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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c03bc16118f49f14f1790d4465d67754ba7957ae6138db6f686ee0d1f48e888' 
  AND token = 'jZ5Q64tUYSR3n9Dk969oLxSlnGLli9OXA5p0uI3xkUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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