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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a652149e17f98aa2c942464c8658450121bcd360cca557e60266a43ffe82d59' 
  AND token = 'pHoFcR1UiHoCc7Ha4+zWWIMfwlib2QVQo+fBXMBMB1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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