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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70716b6daac921dcf94239a5579c6484eef5845cd5ad9088dc7a8362998a2e7' 
  AND token = 'G5CNxxAJ5qkph3uW7leXPXTPwC7BUbs1wCv+p4PihkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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