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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92cfa7597c7c07e169cf4d0c21d9540c1a6661c1a45e4171863bcabdde140bc' 
  AND token = 'PIm2WQppEfuVFUcLGw7U1IxhKWd032Seq12pKC4BKzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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