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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3159024fe4f5e0c89fe729e34a6ecc9ad65e0c626ff57b20bd950417fe9a2dd' 
  AND token = 'zhosdUxGhL9+Xtq1NGupnRrYTVU4/ULOPtrXVh5HlDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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