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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c62e3a018fbf5fd10c915bc1b8e15182464b9d876bd41c81db31a15dc53f73' 
  AND token = '59+fFeaTBnUcXWm28M75dPreVK8ch4RDsIXuKGxLbN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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