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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0a873c9f7ac84b8bf0ea4ff7f218daea46f73daab90c1ec25a8f155c99dcd5' 
  AND token = '/NSBaT8+h8OAj4/vs10m71BpH9oEvHlo7ofYZ9D/MB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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