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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b3f35484bf21faa623045c6674f0aad3ea366d41b848fea9cde0aab05729ef' 
  AND token = '/cN1P583rY7gN+LF3Uw1hj1SLO9KXk8x/QAeiNnqtLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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