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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abd409fde806830ac73ca02734848c534b9145edcab6759cca1e85e4c7500f9' 
  AND token = 'm4j7L8Go6I6t2hqIwDhm9x03fzEUyJqsT8t4DbU0lNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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