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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf35056f88b6fa2346e152f046a5af788ece357b23b17109086e75e558a42a76' 
  AND token = 'GluT+8+98ofI4pxDvZ4GIycKu4fT09XORT5By1lsVb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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