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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b93b4dc43c57a8961dd4e57d158e572c1d0d02eff5393bfbcb6f272e4f45af' 
  AND token = '9MwZbp69Qu8d8TGtoRuD8U+XWJuUkskjgNnNdvdo/Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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