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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547d74bad6dbab814df3edccac6c6bae9a667d3d9cb6c35f645923b426a94ab1' 
  AND token = 'gtnIq49eW0qyjA7lIIdMsXjHecOYstH1RZYPPjFqSXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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