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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bb0cef8bf2182244da6e9f011361cdc7278ef89251b0558c849b4ded8951e6' 
  AND token = 'AXf+8vi+BS4+QO894vdR/wzglh12Ayz5+7L5Adu0BUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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