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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cdf317b8d86a015dbe9e39f18d920f888a43c4fb8a93474d44430dd3d67bfa' 
  AND token = 'OMc/usL7D9dKmTD2UYa/DuxIDaPFp5y3T76eL/5F/Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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