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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d88dbe360f65a7e23a5241367ef38442d3f347f32964ac622caba3ad98c2ec' 
  AND token = '07n8VaO0PgkW3Z2APmQwBO+puYhcJSBOZFMFa/BxnI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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