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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27358ec2f5ddaf9aef96f7115a1ecdf6a480df58c117bb4f952be277850f92b8' 
  AND token = '0U/2OmIJSfKeHoKT2QRZvQisF2SmPhzdjR2a6bAgRlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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