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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b2b6add9ad1dfa6f5c4f6cbe83206cbabad22a937cb0c51e146b38a802813c' 
  AND token = 'z1M4ZrprWW19rjaxHYIW+vDf7HCYbQ4euQGk0X0TzS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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