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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307993764d4cce921a7c64ce1db3c2f8e4bfd5c2cd9a20b0d4564d6c8230c3b6' 
  AND token = 'MSfHUSw4ySf7o1MLAetrM65xgDuuG0VxEzZRKTLKczA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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