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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3446e9ac926e63625b4d3c7eae30f994a8a2a9c530d3c788c223095d24511948' 
  AND token = 'PAbGtb8in1NhQgj08d49+7E2RqWZy6h0+z6GwrKNeuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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