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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d662ca5ee8e56466cd1a29ac12d61b95daf5096e018e0c75d783393b5dd0998' 
  AND token = '3iWZQEZ3blkzcKQzopVxvnZGSPDFNhp7P5JpNktxzqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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